Abstract
Exergy analysis was performed to evaluate the gasification process of torrefied biomass. The rice husk pellets (RHP) were employed as the feedstock in this paper. Two batches of RHP were torrefied for 1h before gasification. One batch was at 250°C and the other one was at 350°C. Gasification was conducted in a 30kWth bubbling fluidized bed. The effects of air equivalence ratio (ER) and torrefaction temperature on overall exergy efficiency were examined in this paper.Results of experiments showed that torrefaction process may raise chemical energy (exergy) of RHP due to lower values of O/C and H/C. However, the overall energy efficiency decreases due to the energy loss in volatile gas and electric energy input during the combined torrefaction-gasification process. The efficiency decrease was more severe for the case of torrefaction at 350°C. The overall exergy efficiencies of the torrefied RHP at 250°C and 350°C are 30% and 21%, respectively.
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